Double helix ladder



FIG. 1 is a perspective view of the ladder of the subject invention;

FIG. 2 is a side plan view of the ladder of the subject invention, the opposite side being a mirror image thereof;

FIG. 3 is a top plan view of the ladder of the subject invention; and,

FIG. 4 is a bottom plan view of the ladder of the subject invention. 

The ornamental design for a double helix ladder, as shown and described. 